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UNITED STATES PATENT WILLIAM G. MEYEEs, OF PHILADELPHIA, PENNSYLVANIA, AND FREDERICK oowAnD, OF CAMDEN, NEW JEnsEY.

DYNAMO-ARMATURE.

SPECIFICATION forming part of Letters Patent No. 389,89 dated September 25, 1888.

Application filed May 5, 1887. Serial No. 337,933.

To all whom it may concern:

Be it known that we, WILLIAM G. Mnrnns, of the city and county of Philadelphia, and State of Pennsylvania, and FREDERICK E. COW'ARD, of the city and county of Camden, and State of New Jersey,citizens of the United States, have invented new and useful Improvements in Armatures for Dynamo-Electric Machines, of which the following is a Specification.

2O tric machine, the combination of insulated guide-bars fastened to end plates and semicircular metallic segments or otherwise suitably segmented platesinsulated from each other at their opposing ends and sides.

Third, in an armature of a dynamoelectric machine, of insulated semicircular metallic segments or otherwise suitably segmented plates mounted on insulated guidebars, the openings between the opposing ends of each segment being out of line with the openings of the preceding and succeeding segments.

On reference to the accompanying sheet of drawings, making part of this specification, Figure l is a longitudinal and diametrical View of ahollow armature-core with sectioned ends for showing the construction and arrangement of the several parts. Fig. 2 is a view of the removable shaft. Fig. 8 is a reduced face View of the end plates. Fig. 4 is a reduced face View of the toothed semicircular segments, with insulating material between their opposing ends. Fig. 5 is also a reduced face View of the semicircular segments without insulating material between their opposing ends, and Fig. (3 is a reduced view of the guide-caps.

Similar letters refer to similar parts in the several views.

A is a removable shaft, and B are perforated end plates on its extremities.

(X0 model.)

C are carryingbars, which center by their ends bearing in insulated openings It of the end plates, B.

D are thin semicircular metallic segments placed side by side on the carrying bars C, which pass through their insulated openings Z), Figs. 1, 4, and 5. They areseparated byinsulatiug-washers E on the bars G, which make air-spaces 0 between them. Tooth-like elevations (1 are formed on periphery of each seg ment D for containing the wires, and they (the segments) are mounted on the carryingbars 0, so as to form rings, their opposing ends 0 held opposite to each other, and with a space,f, between the said opposing ends for air or anyinsulating n1aterial,Figs. l, 3,4,aud 5. While the tooth-like elevations d are aligned, the spaccsf between the opposing ends 0 of the segments are not in line, and do not form a continuous opening, j, the entire length of the segment series, but each openingf is out of line with the openings ofthc preceding and succeeding semicircular segments.

F are fan-blades fixed within the hollow of the armature to collars g, placed loosely on the shaft A and bolted to the end plates, B, or secured in any other manner that will cause them to turn coincidcntly with the shaft without being fixed to it. The shaft A passes snugly throughIa central opening, j, in each end plate, B, Figs. 1 and 8. Screw-threads 7; and nuts Zbind it to the other parts of the armature. By using a collar one of the screws can be dispensed with. The shaft can be withdrawn by loosening the nuts with awrcnch passed into the neck m of either guide-bowl Gr without interfering with the structural combination of the armature.

The revolution of the armature causes its fans to keep up a continuous circulation of air in at the necks m of the guide-bowls G and the openings 0 of the end plates, B, and out through the openings or air-spaces c between the sides of the semicircular segments onto the wires wrapped in the depressions a, between the teeth (6 of the rings D of the armature, by which the tempcrature of the same is kept down.

The purpose of insulating the opposing ends 0 of the semicircular segments is to effectually cut off all currents in the direction of rotation.

The semicircular segments are insulated at their sides and opposing ends 6, to cut off all longitudinal currents in the series of said semicircular segments.

If the opcningsf between the opposing ends 0 of the semicircular segments were in line, they would divide the armature into two parts or halves, the consequence of which would be an abrupt change of the polarity of the armature. Therefore, in building up the armature, the said openingsfare not arranged in line, but each is out of line with the openings of the preceding and succeeding seg ments, by which is accomplished an even advance of magnetism in the armature as it is rotated within the influence of the field-magnets, thereby avoiding the abrupt change in the polarity of the armature which would occur were the openings placed in line.

WVe have illustrated and described our invention by means of an iron plate orring,D, divided into two parts or halves or semicircular segments. Possibly it may be found convenient or necessary to divide the rings D into more than two segments. Therefore we wish it distinctly understood that we do not confine ourselves to any given segmental partition of the rings D.

\Vhat we claim as our invention is 1. In an armature of a dynamo-electric machine, semicircular segments or other wise suitably segmented plates D, mounted on guidebars to form rings, the opposing ends 6 of the segments being insulated from each other by air-spaeesf or any insulating material, g, for the purpose shown and described.

2. In an armature of a dynamoelectric machine, the combination of insulated guide-bars G,attached to end platesand semicircular segments or other suit-ably segmented rings D, insulated from each other at their opposing ends 6 and sides, for the purpose shown and described.

3. In an armature of a dynamo-electric machine, insulated semicircular segments or suitably segmented rings D, mounted on insulated guide-bars C, the openings f between the opposing ends 6 of each segment being out of line with the openings of the preceding and succeeding segments, for the purpose shown and described.

-WILLIAM G. MEYERS. FREDERICK E. CO\VARD.

W'itnesses:

JOHN W. WARTMAN, WM. 0. PARKER. 

